A subleading power operator basis for the scalar quark current
Abstract
Factorization theorems play a crucial role in our understanding of the strong interaction. For collider processes they are typically formulated at leading power and much less is known about power corrections in the λ << 1 expansion. Here we present a complete basis of power suppressed operators for a scalar quark current at O(λ2) in the amplitude level power expansion in the Soft Collinear Effective Theory, demonstrating that helicity selection rules significantly simplify the construction. This basis applies for the production of any color singlet scalar in qq¯¯ annihilation (such as bb¯¯→H ). We also classify all operators which contribute to the cross section at O(λ2) and perform matching calculations to determine their tree level Wilson coefficients. Furthermore, these results can be exploited to study power corrections in both resummed and fixed order perturbation theory, and for analyzing the factorization properties of gauge theory amplitudes and cross sections at subleading power.
- Authors:
-
- Massachusetts Inst. of Technology, Cambridge, MA (United States). Center for Theoretical Physics
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1501476
- Grant/Contract Number:
- SC0011090
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Volume: 2018; Journal Issue: 4; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Effective Field Theories; Perturbative QCD
Citation Formats
Chang, Cyuan -Han, Stewart, Iain W., and Vita, Gherardo. A subleading power operator basis for the scalar quark current. United States: N. p., 2018.
Web. doi:10.1007/jhep04(2018)041.
Chang, Cyuan -Han, Stewart, Iain W., & Vita, Gherardo. A subleading power operator basis for the scalar quark current. United States. https://doi.org/10.1007/jhep04(2018)041
Chang, Cyuan -Han, Stewart, Iain W., and Vita, Gherardo. 2018.
"A subleading power operator basis for the scalar quark current". United States. https://doi.org/10.1007/jhep04(2018)041. https://www.osti.gov/servlets/purl/1501476.
@article{osti_1501476,
title = {A subleading power operator basis for the scalar quark current},
author = {Chang, Cyuan -Han and Stewart, Iain W. and Vita, Gherardo},
abstractNote = {Factorization theorems play a crucial role in our understanding of the strong interaction. For collider processes they are typically formulated at leading power and much less is known about power corrections in the λ << 1 expansion. Here we present a complete basis of power suppressed operators for a scalar quark current at O(λ2) in the amplitude level power expansion in the Soft Collinear Effective Theory, demonstrating that helicity selection rules significantly simplify the construction. This basis applies for the production of any color singlet scalar in qq¯¯ annihilation (such as bb¯¯→H ). We also classify all operators which contribute to the cross section at O(λ2) and perform matching calculations to determine their tree level Wilson coefficients. Furthermore, these results can be exploited to study power corrections in both resummed and fixed order perturbation theory, and for analyzing the factorization properties of gauge theory amplitudes and cross sections at subleading power.},
doi = {10.1007/jhep04(2018)041},
url = {https://www.osti.gov/biblio/1501476},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 4,
volume = 2018,
place = {United States},
year = {Mon Apr 09 00:00:00 EDT 2018},
month = {Mon Apr 09 00:00:00 EDT 2018}
}
Web of Science
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